A hamburger or burger is a sandwich consisting of one or extra cooked patties of ground meat, commonly beef, positioned inside a sliced bread roll or bun. The patty can be pan fried, barbecued, or flame broiled. Hamburgers are often served with cheese, lettuce, tomato, Francis Bacon, onion, pickles, or chiles; condiments which includes mustard, mayonnaise, ketchup, take pleasure in, or "unique sauce"; and are often positioned on sesame seed buns. A hamburger topped with a slice of cheese is called cheeseburger.

The term "burger" also can be applied to the meat patty on its own, especially inside the united kingdom wherein the time period "patty" is rarely used, or the time period may even refer surely to ground beef. The time period can be prefixed with the form of meat or meat substitute used, as in "turkey burger", "bison burger", or "veggie burger".

Hamburgers are bought at fast-meals restaurants, diners, and strong point and high-cease restaurants (where burgers may also promote for numerous times the value of a fast-food burger, however can be one of the cheaper options at the menu). there are many global and local variations of the hamburger.